A playground merry-go-round of radius r 220 m has a moment, Physics

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A playground merry-go-round of radius r 220 m has a moment

A playground merry-go-round of radius R = 2.20 m has a moment of inertia I = 235 kg · m2 and is rotating at 12.0 rev/min about a frictionless vertical axle. Facing the axle, a 23.0-kg child hops onto the merry-go-round and manages to sit down on the edge. What is the new angular speed of the merry-go-round?

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Physics: A playground merry-go-round of radius r 220 m has a moment

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